Self-healing, reprocessing and 3D printing of transparent and hydrolysis-resistant silicone elastomers

Li, Zhu; Peng, Hong; Huang, Ziying; Zhang, Ting; Xu, Ruijie; Chen, Lijuan; Xiang, Hongping; Liu, Xiaoxuan

doi:10.1016/j.cej.2020.124142

“…An increase of E ′ and T g were found for the reprocessed films in DSC and DMA tests (Figure S7c,d and Table S7). These may be caused by increased density of the films after repeated reprocessing under pressure and growth cross‐linking density of the networks [30] . Similar gel contents were also obtained for the samples after thermal reprocessing.…”

Section: Resultssupporting

confidence: 69%

Renewable Castor‐Oil‐based Waterborne Polyurethane Networks: Simultaneously Showing High Strength, Self‐Healing, Processability and Tunable Multishape Memory

Zhang

¹

,

Liang

²

,

Liang

³

et al. 2020

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Materials with multifunctionality or multiresponsiveness, especially polymers derived from green, renewable precursors, have recently attracted significant attention resulting from their technological impact. Nowadays, vegetable‐oil‐based waterborne polyurethanes (WPUs) are widely used in various fields, while strategies for simultaneous realization of their self‐healing, reprocessing, shape memory as well as high mechanical properties are still highly anticipated. We report development of a multifunctional castor‐oil‐based waterborne polyurethane with high strength using controlled amounts of dithiodiphenylamine. The polymer networks possessed high tensile strength up to 38 MPa as well as excellent self‐healing efficiency. Moreover, the WPU film exhibited a maximum recovery of 100 % of the original mechanical properties after reprocessing four times. The broad glass‐transition temperature of the samples endowed the films with a versatile shape‐memory effect, including a dual‐to‐quadruple shape‐memory effect.

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“…These may be caused by increased density of the films after repeated reprocessing under pressure and growth cross-linking density of the networks. [30] Similar gel contents were also obtained for the samples after thermal reprocessing.I nterestingly,t he reprocessed samples,e specially for PU-DTDA20, showed improvement of thermal stability due to the increased crosslinking density in the reprocessing process (Table S7). In short, PU films with excellent reprocessability were constructed by tuning the content of disulfides in vegetable-oilbased PUDs.T he self-healing and reprocessing properties of the PU films could prolong the service life of related products and thereby reduce environment pollution and resource waste.…”

Section: Methodssupporting

confidence: 65%

Renewable Castor‐Oil‐based Waterborne Polyurethane Networks: Simultaneously Showing High Strength, Self‐Healing, Processability and Tunable Multishape Memory

Zhang

¹

,

Liang

²

,

Liang

³

et al. 2020

View full text Add to dashboard Cite

Materials with multifunctionality or multiresponsiveness, especially polymers derived from green, renewable precursors, have recently attracted significant attention resulting from their technological impact. Nowadays, vegetable‐oil‐based waterborne polyurethanes (WPUs) are widely used in various fields, while strategies for simultaneous realization of their self‐healing, reprocessing, shape memory as well as high mechanical properties are still highly anticipated. We report development of a multifunctional castor‐oil‐based waterborne polyurethane with high strength using controlled amounts of dithiodiphenylamine. The polymer networks possessed high tensile strength up to 38 MPa as well as excellent self‐healing efficiency. Moreover, the WPU film exhibited a maximum recovery of 100 % of the original mechanical properties after reprocessing four times. The broad glass‐transition temperature of the samples endowed the films with a versatile shape‐memory effect, including a dual‐to‐quadruple shape‐memory effect.

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“…There are few reports of VP-3D-printed objects fabricated with intrinsically SH polymeric materials, related mainly to elastomers. These systems are based on the diffusion of a mending agent, such as Poly (caprolactone) upon heating and cooling 41 , electrostatic interactions, such as hydrogen bonds 42 and ionic bonds 43 , or dynamic covalent chemistry, such as disulfide bonds 44 . However, to the best of our knowledge, there are no reports on 3D-printed hydrogels produced via VP with self-repairing properties due to the chemical, physical, and technological limitations described above.…”

Section: Introductionmentioning

confidence: 99%

3D-printed self-healing hydrogels via Digital Light Processing

Caprioli

¹

,

Roppolo

²

,

Chiappone

³

et al. 2021

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Self-healing hydrogels may mimic the behavior of living tissues, which can autonomously repair minor damages, and therefore have a high potential for application in biomedicine. So far, such hydrogels have been processed only via extrusion-based additive manufacturing technology, limited in freedom of design and resolution. Herein, we present 3D-printed hydrogel with self-healing ability, fabricated using only commercially available materials and a commercial Digital Light Processing printer. These hydrogels are based on a semi-interpenetrated polymeric network, enabling self-repair of the printed objects. The autonomous restoration occurs rapidly, at room temperature, and without any external trigger. After rejoining, the samples can withstand deformation and recovered 72% of their initial strength after 12 hours. The proposed approach enables 3D printing of self-healing hydrogels objects with complex architecture, paving the way for future applications in diverse fields, ranging from soft robotics to energy storage.

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Self-healing, reprocessing and 3D printing of transparent and hydrolysis-resistant silicone elastomers

Cited by 116 publications

References 66 publications

Renewable Castor‐Oil‐based Waterborne Polyurethane Networks: Simultaneously Showing High Strength, Self‐Healing, Processability and Tunable Multishape Memory

Renewable Castor‐Oil‐based Waterborne Polyurethane Networks: Simultaneously Showing High Strength, Self‐Healing, Processability and Tunable Multishape Memory

Renewable Castor‐Oil‐based Waterborne Polyurethane Networks: Simultaneously Showing High Strength, Self‐Healing, Processability and Tunable Multishape Memory

3D-printed self-healing hydrogels via Digital Light Processing

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